When using Safari if I want to log into a previously saved website I normally click the logo in the toolbar which fires up the plug in and then start typing the login i require. When it's shortlisted I either arrow down to the correct entry or if it's at the top just hit return. On a couple I've had the message that Safari can't log in because the first part of the address is not valid. When I navigate to the address stored though within 1Password it opens up ok. There is only one address stores as well so it's not as if it trying for the wrong one.
It's not anthem all just one or two. The first one I corrected because it handy got a www before it but this late one has.
It is a bug?